winx club and the rainbow mystery

It's just an ordinary summer for the winx they decided to stay at Alfea during summer break but what happens when they learn the story of the 4 rainbow princesses and a long forgotten planet. You'll have to read it figure out.
I do not own winx club all planets and power and people belong to Rainbow and Indigo I only own the characters , planets and powers I made up.
so sit back relax and enjoy :)